DEVICE FOR MEASURING THE DISTANCE AND SPEED OF APPROACH OR DEPARTURE OF A MOBILE TARGET

摘要

Radiodistancemeter with slaved modulation so as to make constant the beat frequency between the transmitted signal and the received signal. This device is suitable for measuring the speed of approaching or moving away from a moving target, by means of a fixed frequency generator which, after frequency division, maintains fixed the time between the start of two teeth of consecutive saws A particular line of the beat signal is demodulated by this fixed frequency through a mixer, the output of which is filtered by a low pass filter. The signal at the output of the filter has a frequency equal to the Doppler frequency, proportional to the speed. Application: guiding the docking maneuver of a large boat.